tolong ya guys no 12nya

(1/32)^3-5x = (2)(2^2)....(2^20)
(2^-5)^3-5x = (2)^1+2+...+20
(2)^25x-15 = (2)^1+2+...+20
25x-15 = 1+2+...+20
25x-15 = (20/2(1+20)) ---> pake rumus arimatika

25x-15 = 210
25x = 225
x = 9

Jawaban ada di foto yaa